If The Hundred are actually just uberciphrang, then I think its possible for a Human/Nonman/Other to become like them. "Like them" meaning able to carve out some kind of niche within the outside, where their subjective influence becomes objective morality. From their, the most powerful of "Gods" exert so much subjective influence that they are able to moderately change the objective reality of Earwa.
I'm basically saying I don't think its unreasonable to suggest that someone like Seswatha, who presumably had a lot of follower during his lifetime, was able to somehow overcome death and become a "God" of his own. I also think that there is a good chance that schoolmen are uniquely situated to this end, since they know a thing or two are force reality to bend to their whim.